Spybot isn't recommended for use with McAfee especially if you use its Teatimer process. Running it at the same time as Quickclean meant that files were probably locked by Spybot while they were being scanned.
Quickclean isn't guaranteed to clean everything as some files can't be removed because Windows makes them read only or encrypts them. Where exactly were these files?
There are some 3rd party tools mentioned about halfway down the last link in my signature below.